I passed the accumulated wisdom of the list (three people fingered the OXS sensor as a cause of his "surging") and he enquired about the price. GBP150 from Audi! So he'd like to be sure. Apart from the ECU codes - any other diagnostics? Steady state voltage? -- Phil Payne Phone: 0385 302803 Fax: 01536 723021 (The contents of this post will _NOT_ appear in the UK Newsletter.)